如何在activex中指定自己的宽和长

[Gaojian_10]

一般来说:activex的宽度和高度,是由他的包容器来指定的.
但是我想在activex里面自己指定调整,如何..
我用mfc开发的activex.
在CEdisignCtrl::OnCreate()函数中movewindows没什么作用.

[masterz]

usually your control implement IOleObject interface, you can specify preferred size in IOleObject::GetExtent, if your control also implements IViewObject2 interface, IViewObject2::GetExtent must do the same thing

IOleObject::GetExtent
Retrieves a running object's current display size.

HRESULT GetExtent(
DWORD dwDrawAspect, //Value indicating object aspect
SIZEL *psizel //Pointer to storage of object size limit
);
A container calls IOleObject::GetExtent on a running object to retrieve its current display size. If the container can accommodate that size, it will normally do so because the object, after all, knows what size it should be better than the container does. A container normally makes this call as part of initializing an object.
The display size returned by IOleObject::GetExtent may differ from the size last set by IOleObject::SetExtent because the latter method dictates the object's display space at the time the method is called but does not necessarily change the object's native size, as determined by its application.

Note This method must return the same size as DVASPECT_CONTENT for all the new aspects in DVASPECT2. IViewObject2::GetExtent must do the same thing.

If one of the new aspects is requested in dwAspect, this method can either fail or return the same rectangle as for the DVASPECT_CONTENT aspect.

Notes to Callers
Because a container can make this call only to a running object, the container must instead call IViewObject2::GetExtent if it wants to get the display size of a loaded object from its cache.
Notes to Implementers
Implementation consists of filling the sizel structure with an object's height and width.